if __name__ == '__main__':
	from Tkinter import *
	canvas=Canvas(width=300,height=300,bg="green")
	canvas.pack(expand=YES,fill=BOTH)
	x0=263
	y0=263
	y1=275
	x1=275
	for i in range(19):
		canvas.create_line(x0,y0,x0,y1,width=1,fill="red")
		x0=x0-5
		y0=y0-5
		x1=x1+5
		y1=y1+5
	x0=263
	y1=275
	y0=263
	for i in range(21):
		canvas.create_line(x0,y0,x0,y1,fill="red")
		x0+=5
		y0+=5
		y1+=5
	mainloop()